US20130136384A1 - Rotary table for a machine tool - Google Patents

Rotary table for a machine tool Download PDF

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Publication number
US20130136384A1
US20130136384A1 US13/467,616 US201213467616A US2013136384A1 US 20130136384 A1 US20130136384 A1 US 20130136384A1 US 201213467616 A US201213467616 A US 201213467616A US 2013136384 A1 US2013136384 A1 US 2013136384A1
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US
United States
Prior art keywords
rotary table
lubricant
base unit
tank
wear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/467,616
Inventor
Peter T.H. Tsai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALEX-TECH MACHINERY INDUSTRIAL Co Ltd
Alex Tech Machinery Ind Co Ltd
Original Assignee
Alex Tech Machinery Ind Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alex Tech Machinery Ind Co Ltd filed Critical Alex Tech Machinery Ind Co Ltd
Assigned to ALEX-TECH MACHINERY INDUSTRIAL CO., LTD. reassignment ALEX-TECH MACHINERY INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSAI, PETER T.H.
Publication of US20130136384A1 publication Critical patent/US20130136384A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/44—Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • B23Q1/52—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism a single rotating pair
    • B23Q1/522—Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism a single rotating pair which is perpendicular to the working surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
    • B23Q11/122—Lubricant supply devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/1045—Details of supply of the liquid to the bearing
    • F16C33/1055—Details of supply of the liquid to the bearing from radial inside, e.g. via a passage through the shaft and/or inner sleeve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q2220/00—Machine tool components
    • B23Q2220/004—Rotary tables
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General build up of machine tools, e.g. spindles, slides, actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
    • F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure

Definitions

  • a base unit having an upper surface that is formed with a lubricant groove adapted for passage of liquid lubricant;
  • a wear-resistant member covering the lower surface; wherein a space is formed between the upper surface and the wear-resistant member for permitting flow of the liquid lubricant away from the lubricant groove through the space.
  • FIG. 2 is a fragmentary sectional view of a preferred embodiment of a rotary table according to the invention.
  • FIG. 3 is an enlarged fragmentary sectional view of the preferred embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Machine Tool Units (AREA)

Abstract

A rotary table includes a base unit having an upper surface that is formed with a lubricant groove adapted for passage of liquid lubricant, a table unit mounted rotatably on the base unit and having a lower surface, and a wear-resistant member covering the lower surface. A space is formed between the upper surface and the wear-resistant member for permitting flow of the liquid lubricant away from the lubricant groove through the space.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application claims priority of Taiwanese Application No. 100143119, filed on Nov. 24, 2011.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The invention relates to a rotary table, more particularly to a rotary table for a machine tool.
  • 2. Description of the Related Art
  • A rotary table in a machine tool is operable for changing position of a workpiece fixed thereon relative to a cutting unit of the machine tool. Some rotary tables are even capable of different rotating movements so as to provide different cutting modes. Due to the large dimensions of the rotary table, use of high-precision bearings for assisting rotating movement of the rotary table may significantly increase the production cost. Therefore, a technique of coating a wear-resistant layer was developed for use in place of the high-precision bearings.
  • As shown in FIG. 1, a conventional rotary table 10 of a machine tool disclosed in Taiwanese Patent Publication No. I334370 includes a base 11 and a table 12. The base 11 has a supporting portion 111 on which a wear-resistant layer 112 is coated, wherein the wear-resistant layer 112 has a material selected from one of epoxy resin, fluoro-resin, diamond resin, and a combination thereof. The table 12 is mounted on the base 11, is rotatable about an axis (1), and has a bottom portion 121 having a portion in contact with the wear-resistant layer 112. During rotating movement of the rotary table 10, the wear-resistant layer 112 serves to reduce wear between the supporting portion 111 and the bottom portion 121.
  • However, such a configuration of the wear-resistant layer 112 may suffer from excess heat generated during operation, which may cause deformation of the base 11 and the table 12 and hence may have an adverse effect on accuracy of resultant workpieces.
    • SUMMARY OF THE INVENTION
  • Therefore, the object of the present invention is to provide a rotary table having function of lubrication and heat-dissipation.
  • Accordingly, a rotary table of the present invention comprises:
  • a base unit having an upper surface that is formed with a lubricant groove adapted for passage of liquid lubricant;
  • a table unit mounted rotatably on the base unit, and having a lower surface; and
  • a wear-resistant member covering the lower surface; wherein a space is formed between the upper surface and the wear-resistant member for permitting flow of the liquid lubricant away from the lubricant groove through the space.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment with reference to the accompanying drawings, of which:
  • FIG. 1 is a fragmentary sectional view of a conventional rotary table;
  • FIG. 2 is a fragmentary sectional view of a preferred embodiment of a rotary table according to the invention; and
  • FIG. 3 is an enlarged fragmentary sectional view of the preferred embodiment.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • As shown in FIGS. 2 and 3, a preferred embodiment of a rotary table for a machine tool (not shown) according to the present invention comprises a base unit 20, a table unit 30 that is mounted rotatably on the base unit 20, and a liquid circulating system 23.
  • The base unit 20 includes a main portion 21 and a supporting portion 22 extending upwardly from the main portion 21. The supporting portion 22 has an upper surface 221 that is sloped to form a predetermined angle with horizontal, and that is formed with a lubricant groove 222 adapted for receiving liquid lubricant.
  • The table unit 30 includes a lower portion 31 having a sloped lower surface 311 supported rotatably by the supporting portion 22 of the base unit 20. The rotary table further comprises a wear-resistant member 312 covering the lower surface 311. In this embodiment, the wear-resistant member 312 may be made from epoxy resin, fluoro-resin, or diamond resin.
  • The rotary table further comprises a liquid circulating system 23 that includes a tank 231, a first conduit 233 extended through the supporting portion 22 of the base unit 20 toward the upper surface 221, a pump 232 fluidly connecting the tank 231 to the first conduit 233, and a pair of second conduits 234 extending through the main portion 21 of the base unit 20 at opposite sides of the supporting portion 22 and fluidly communicating the tank 231.
  • The liquid lubricant is initially stored in the tank 231. During operation of the rotary table of this invention, the liquid lubricant is drawn by the pump 232 out of the tank 231 and introduced into the lubricant groove 222 via the first conduit 233. As the liquid lubricant is continuously drawn from the tank 231 into the lubricant groove 222, the overflowed lubricant flows away from the lubricant groove 222 through a space that is defined between the upper surface 221 and the wear-resistant member 312 for reducing friction therebetween and carrying away heat that is generated from the rotating movement of the table unit 30 relative to the base unit 20. Additionally, the sloped upper surface 221 of the base unit 20 and the lower surface 311 of the table unit 30 further facilitates the flow of the lubricant out of the lubricant groove 222. Finally, the lubricant exits the space flows back to the tank 231 via the second conduits 234 for completing the circulation of the lubricant, and the heat is dissipated by virtue of the circulation of the lubricant.
  • It is noted that in the rotating movement of the rotary table, the wear-resistant member 312 effectively reduces the wear between the supporting portion 22 and the lower portion 31, and by virtue of the liquid circulating system 23, the rotating movement is lubricated and the heat generated therein is successfully dissipated. Thus, the machine tool with the rotary table of the preferred embodiment has a longer service life and the machining accuracy thereof is not adversely affected.
  • While the present invention has been described in connection with what is considered the most practical and preferred embodiment, it is understood that this invention is not limited to the disclosed embodiment but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.

Claims (3)

What is claimed is:
1. A rotary table for a machine tool, comprising:
a base unit having an upper surface that is formed with a lubricant groove adapted for passage of liquid lubricant;
a table unit mounted rotatably on said base unit, and having a lower surface; and
a wear-resistant member covering said lower surface;
wherein a space is formed between said upper surface and said wear-resistant member for permitting flow of the liquid lubricant away from said lubricant groove through said space.
2. The rotary table as claimed in claim 1, further comprising a liquid circulating system that includes
a tank adapted for storing the liquid lubricant,
a first conduit extended through said base unit toward said upper surface,
a pump fluidly connecting said tank to said first conduit, and operable for pumping the liquid lubricant from said tank into said lubricant groove via said first conduit, and
a second conduit in fluid communication with said tank, and adapted for permitting flow of the liquid lubricant from said space into said tank.
3. The rotary table as claimed in claim 1, wherein said upper surface of said base unit is sloped, and forms a predetermined angle with horizontal.
US13/467,616 2011-11-24 2012-05-09 Rotary table for a machine tool Abandoned US20130136384A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW100143119A TW201321119A (en) 2011-11-24 2011-11-24 Rotary worktable for machine tool
TW100143119 2011-11-24

Publications (1)

Publication Number Publication Date
US20130136384A1 true US20130136384A1 (en) 2013-05-30

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US13/467,616 Abandoned US20130136384A1 (en) 2011-11-24 2012-05-09 Rotary table for a machine tool

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TW (1) TW201321119A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016006394A1 (en) * 2014-07-11 2016-01-14 東芝機械株式会社 Industrial machine provided with foreign matter expulsion mechanism
JP2018065217A (en) * 2016-10-19 2018-04-26 ファナック株式会社 Drain mechanism and machine tool including the same
CN108705495A (en) * 2018-06-08 2018-10-26 西安萨特五金工具有限公司 A kind of safe bridge facility
US10810547B2 (en) 2016-11-25 2020-10-20 Fanuc Corporation Injection molding management system
CN114183439A (en) * 2021-12-08 2022-03-15 徐州健川机械制造有限公司 Combined slewing bearing device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800375A (en) * 1953-07-16 1957-07-23 Escher Wyss Ag Slide track for machine tools
US2885915A (en) * 1956-08-16 1959-05-12 Giddings & Lewis Machine tool table
US3583205A (en) * 1968-07-09 1971-06-08 Genisco Technology Corp Rate table
US3753604A (en) * 1971-06-11 1973-08-21 Skf Co Pressure fluid distributor at an hydrostatic bearing
US4030787A (en) * 1976-03-30 1977-06-21 The Boeing Company Turntable bearing
US4076339A (en) * 1977-01-19 1978-02-28 National Automatic Tool Company, Inc. Air bearing assembly for rotational table
US4656951A (en) * 1984-05-25 1987-04-14 Citizen Watch Co., Ltd. Rotary table unit
US5035519A (en) * 1987-02-02 1991-07-30 Hitachi, Ltd. Submersible thrust bearing apparatus
US5239892A (en) * 1990-08-27 1993-08-31 Mitutoyo Corporation Rotating device
US5599108A (en) * 1991-07-17 1997-02-04 Toshiba Kikai Kabushiki Kaisha Static pressure table device with a tapered surface
EP2027965A1 (en) * 2007-08-23 2009-02-25 Alex-Tech Machinery Industrial Co. Ltd. Rotatable worktable assembly of a machining apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800375A (en) * 1953-07-16 1957-07-23 Escher Wyss Ag Slide track for machine tools
US2885915A (en) * 1956-08-16 1959-05-12 Giddings & Lewis Machine tool table
US3583205A (en) * 1968-07-09 1971-06-08 Genisco Technology Corp Rate table
US3753604A (en) * 1971-06-11 1973-08-21 Skf Co Pressure fluid distributor at an hydrostatic bearing
US4030787A (en) * 1976-03-30 1977-06-21 The Boeing Company Turntable bearing
US4076339A (en) * 1977-01-19 1978-02-28 National Automatic Tool Company, Inc. Air bearing assembly for rotational table
US4656951A (en) * 1984-05-25 1987-04-14 Citizen Watch Co., Ltd. Rotary table unit
US5035519A (en) * 1987-02-02 1991-07-30 Hitachi, Ltd. Submersible thrust bearing apparatus
US5239892A (en) * 1990-08-27 1993-08-31 Mitutoyo Corporation Rotating device
US5599108A (en) * 1991-07-17 1997-02-04 Toshiba Kikai Kabushiki Kaisha Static pressure table device with a tapered surface
EP2027965A1 (en) * 2007-08-23 2009-02-25 Alex-Tech Machinery Industrial Co. Ltd. Rotatable worktable assembly of a machining apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016006394A1 (en) * 2014-07-11 2016-01-14 東芝機械株式会社 Industrial machine provided with foreign matter expulsion mechanism
CN105517756A (en) * 2014-07-11 2016-04-20 东芝机械株式会社 Industrial machine provided with foreign matter expulsion mechanism
US10022831B2 (en) 2014-07-11 2018-07-17 Toshiba Kikai Kabushiki Kaisha Industrial machine provided with foreign matter expulsion mechanism
JP2018065217A (en) * 2016-10-19 2018-04-26 ファナック株式会社 Drain mechanism and machine tool including the same
US10343245B2 (en) 2016-10-19 2019-07-09 Fanuc Corporation Liquid drainage mechanism and machine tool equipped with liquid drainage mechanism
US10810547B2 (en) 2016-11-25 2020-10-20 Fanuc Corporation Injection molding management system
CN108705495A (en) * 2018-06-08 2018-10-26 西安萨特五金工具有限公司 A kind of safe bridge facility
CN114183439A (en) * 2021-12-08 2022-03-15 徐州健川机械制造有限公司 Combined slewing bearing device

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALEX-TECH MACHINERY INDUSTRIAL CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TSAI, PETER T.H.;REEL/FRAME:028182/0646

Effective date: 20120411

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION